| Because the implementation of halon phaseout program, the research of the halon substitutes is particularly urgent, and due to its high efficiency, clean, friendly to environment, atmospheric storage, etc S-type hot aerosol extinguishing technology turns to the first selection of halon substitutes, Widely used in high (low) voltage power distribution room, record room, computer room, generator room, cable well etc. S-type hot aerosol extinguishing equipment consists of shell with numerous small nozzle, Agent of aerosol fire extinguishing agent, coolant. Ignition device. Studing on S-type hot aerosol extinguishing equipment is of great significance for the effect of concentration distribution properties.This paper takes the nozzle of S-type hot aerosol extinguishing equipment as the research object, adopts the fire dynamics software FDS, under the different nozzle set simulates the release of the flue gas process to S-type hot aerosol extinguishing equipment.The influence of the number of the nozzle, the nozzle shape, the influence of the nozzle of S-type hot aerosol extinguishing equipment upon concentrations distributions has been discussed. The space of aerosol fire extinguishing agent to achieve uniform distribution of time has been analysed. The results show that:1.Underthe arrangement of the nozzle remaining the same, when a single nozzle area is2cm x7cm, with the reduction in the number of nozzle of S-type hot aerosol extinguishing equipment, when the size of the protective space is3m x4.87m x4.87m, aerosol fire extinguishing agent to achieve uniform distribution of time first decreases and then increases, the maximum temperature decreases gradually. Geting the best nozzle number to72. The changing of the number to the nozzle can be equivalent to the area of the nozzle, the area of the nozzle for1008cm2is the best.2.Underthe arrangement of the nozzle remaining the same, with the changing of the shape of nozzle of S-type hot aerosol extinguishing equipment, when the size of the protective space is3m x4.87m x4.87m, aerosol fire extinguishing agent to achieve uniform distribution of the time is difference,maximum temperature of the nozzle is difference. the nozzle shape for6cm x7cm is the best.3.Under the nozzle with a total area remaining the same, when a single nozzle area is2cm x7cm, with the changing of the arrangement of nozzle of S-type hot aerosol extinguishing equipment. under the box on the surface of the three lower surface, when the size of the protective space is3m x4.87m x4.87m. aerosol fire extinguishing agent to achieve uniform distribution of time is the smallest. the arrangement of nozzle located in the the box on the surface of the three lower surface is the best.4.According to the above conclusion, the nozzle of S-type hot aerosol extinguishing equipment has been set, namely when the area of the nozzle for1008cm2, the shape of the nozzle is6cm x7cm, he arrangement of nozzle located in the the box on the surface of the three lower surface is the best. |
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